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// Portions Copyright [2019] Payara Foundation and/or affiliates

package com.sun.enterprise.admin.monitor.stats;

/** An implementation of a AverageRangeStatistic. All instances of this class are
 * immutable. Provides all the necessary accessors for properties.
 * @author Larry White
 * @author Kedar Mhaswade
 * @since S1AS8.1
 * @version 1.0
 */
public class AverageRangeStatisticImpl implements 
	AverageRangeStatistic /*BoundedRangeStatistic*/ {
    
    private BoundedRangeStatisticImpl boundedRangeStatistic = null;
    private long                                numberOfSamples;
    private long                                runningTotal;    
    
    
	/**
     * Constructs an immutable instance of AverageRangeStatisticImpl.
     * @param curVal    The current value of this statistic
     * @param highMark  The highest value of this statistic, since measurement 
     *                  started
     * @param lowMark   The lowest value of this statistic, since measurement
     *                  started
     * @param upper     The upper limit of this statistic
     * @param lower     The lower limit of this statistic
     * @param name      The name of the statistic
     * @param unit      The unit of measurement for this statistic
     * @param desc      A brief description of the statistic
     * @param startTime Time in milliseconds at which the measurement was started
     * @param sampleTime Time at which the last measurement was done.
     * @param numberOfSamples number of samples at present
     * @param runningTotal running total of sampled data at present
     **/    
	public AverageRangeStatisticImpl(long curVal, long highMark, long lowMark,
                                     long upper, long lower, String name,
                                     String unit, String desc, long startTime,
                                     long sampleTime, long numberOfSamples,
                                     long runningTotal) {
                                         
        boundedRangeStatistic = new BoundedRangeStatisticImpl(curVal, highMark, lowMark,
                                     upper, lower, name,
                                     unit, desc, startTime,
                                     sampleTime);                                 
                                         
        this.numberOfSamples = numberOfSamples;
        this.runningTotal = runningTotal;
    } 
        
	/**
     * Constructs an immutable instance of AverageRangeStatisticImpl.
     * @param stats a BoundedRangeStatisticImpl
     * @param numberOfSamples number of samples at present
     * @param runningTotal running total of sampled data at present
     **/    
	public AverageRangeStatisticImpl(BoundedRangeStatisticImpl stats, 
                long numberOfSamples, long runningTotal) {                                         
        boundedRangeStatistic = stats;                                                                          
        this.numberOfSamples = numberOfSamples;
        this.runningTotal = runningTotal;
    }         
   
    @Override
    public long getCurrent() {
        return boundedRangeStatistic.getCurrent();
    }

    @Override
    public String getDescription() {
        return boundedRangeStatistic.getDescription();
    }

    @Override
    public long getHighWaterMark() {
        return boundedRangeStatistic.getHighWaterMark();
    }

    @Override
    public long getLastSampleTime() {
        return boundedRangeStatistic.getLastSampleTime();
    }

    @Override
    public long getLowWaterMark() {
        return boundedRangeStatistic.getLowWaterMark();
    }

    @Override
    public String getName() {
        return boundedRangeStatistic.getName();
    }

    @Override
    public long getStartTime() {
        return boundedRangeStatistic.getStartTime();
    }

    @Override
    public String getUnit() {
        return boundedRangeStatistic.getUnit();
    }
        
    @Override
    public long getAverage() {
        if(numberOfSamples == 0) {
            return -1;
        } else {
            return runningTotal / numberOfSamples;
        }        
    }
    /** This is a hack. This method allows us to internatinalize the descriptions.
        See bug Id: 5045413
    */
    public void setDescription(final String desc) {
        this.boundedRangeStatistic.setDescription(desc);
    }
    
}
